It is my favorite time of year to visit! No crowds, it is easy to feel that you have the whole valley to yourself. The lodge is comfortable and the cafeteria is open. Camping and tent lodging are c-c-cold. And yes, the park store is reasonable for groceries and prepared foods. Be prepared for the low level of light because there is little direct sun at this time of year. If you want to splurge, a meal at the Ahwahnee Hotel can be memorable (or stay there and enjoy the comfort!). It's a great time to make pictures, there is usually beautiful drama in the atmosphere and sky.